I'm torn between [[http://www.outdoorkit.co.uk/product.php?product_id=944 these North face]] and [[http://www.amazon.co.uk/Hi-Tec-Lady-Moritz-walking-boots/dp/B001K6SH4E these hi tec]]. ILs live in rural highlands, so serious snow when we visit there, plus a fair amount at home, plus ice. Want warm, waterproof and grippy. What do you think?